Add ChangeLog; fix build:release

Author: ziyiz-amzn

CHANGELOG.md

@@ -16,6 +16,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Removed
 
 ### Changed
+- Add support for React 19.
+- Migrate storybook to v8.
+- Migrate Jest to v29.
+- Rewrite PopOver component using floating-ui
 
 ### Fixed
 

src/theme/themes.stories.tsx

@@ -1,3 +1,6 @@
+// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
+
 import React from 'react';
 import type { Meta, StoryObj } from '@storybook/react';
 import { ThemeProvider } from 'styled-components';